diff options
| -rw-r--r-- | .gitignore | 2 | ||||
| -rw-r--r-- | package-lock.json | 1375 | ||||
| -rw-r--r-- | package.json | 15 | ||||
| -rwxr-xr-x | server.js | 180 | ||||
| -rw-r--r-- | static/index.css | 91 | ||||
| -rw-r--r-- | static/index.html | 13 | ||||
| -rw-r--r-- | static/index.js | 196 |
7 files changed, 1872 insertions, 0 deletions
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exit 1" + }, + "author": "Tom Smeding", + "license": "MIT", + "dependencies": { + "express": "^4.18.1", + "socket.io": "^4.5.1" + } +} diff --git a/server.js b/server.js new file mode 100755 index 0000000..21d9094 --- /dev/null +++ b/server.js @@ -0,0 +1,180 @@ +#!/usr/bin/env node +const express = require("express"); +const http = require("http"); +const socketio = require("socket.io"); +const fs = require("fs"); + +const [DBFILE, PORT] = (() => { + if (process.argv.length == 3) { + return [process.argv[2], 8000]; + } else if (process.argv.length == 4) { + return [process.argv[2], +process.argv[3]]; + } else { + console.log("Usage: ./server.js <dbfile.txt> [port]"); + process.exit(1); + } +})(); + +const app = express(); +const httpServer = http.Server(app); +const io = socketio(httpServer); + +const STATIC = __dirname + "/static"; + + +// ------------------------------ +// "database" +// ------------------------------ + +class Database { + #filename; + #list; + #lastbackup; + + constructor(filename) { + this.#filename = filename; + this.#list = JSON.parse(fs.readFileSync(this.#filename)); + this.#lastbackup = new Date(); + } + + add_new(string) { + for (let i = 0; i < this.#list.length; i++) { + if (this.#list[i][1] == string) { + return "already existed"; + } + } + + this.#list.push([0, string]); + this.#sort(); + this.#persist(); + + return null; + } + + set_votes(string, votes) { + for (let i = 0; i < this.#list.length; i++) { + if (this.#list[i][1] == string) { + this.#list[i][0] = votes; + this.#sort(); + this.#persist(); + return null; + } + } + + return `'${string}' does not exist`; + } + + remove(string) { + for (let i = 0; i < this.#list.length; i++) { + if (this.#list[i][1] == string) { + this.#list.splice(i, 1); + this.#persist(); + return null; + } + } + + return "does not exist"; + } + + get() { + return this.#list; + } + + #sort() { + this.#list.sort((a, b) => { + if (a[0] != b[0]) return b[0] - a[0]; + if (a[1] < b[1]) return -1; + if (a[1] > b[1]) return 1; + return 0; + }); + } + + #persist() { + fs.writeFile(this.#filename, JSON.stringify(this.#list), err => { + if (err != null) { + console.error("Error writing to file:", err); + console.log(JSON.stringify(this.#list)); + } + }); + + const now = new Date(); + if (now - this.#lastbackup > 60 * 1000) { + const dotidx = this.#filename.lastIndexOf("."); + const bakfname = + dotidx == -1 + ? this.#filename + now.getTime() + : this.#filename.slice(0, dotidx) + "." + now.getTime() + this.#filename.slice(dotidx); + fs.writeFile(bakfname, JSON.stringify(this.#list), err => { + if (err != null) { + console.error("Error copying to backup file:", err); + } else { + console.log(`Copied to ${bakfname}`); + } + }); + + this.#lastbackup = now; + } + } +}; + +const database = new Database(DBFILE); + + +// ------------------------------ +// Express routes +// ------------------------------ + +app.use(express.static(STATIC)); + +app.get("/", (req, res) => { + res.sendFile(STATIC + "/index.html"); +}); + + +// ------------------------------ +// socket.io bindings +// ------------------------------ + +let next_socket_id = 1; +let num_connected = 0; + +io.on("connection", socket => { + const socket_id = next_socket_id++; + if (++num_connected >= 2) { + socket.emit("alert", `You're user number ${num_connected}, multi-user settings will mess up!`); + } + console.log(`new socket connection id=${socket_id} (nc=${num_connected})`); + + socket.on("disconnect", () => { + num_connected--; + console.log(`disconnect id=${socket_id} (nc=${num_connected})`); + }); + + socket.on("new", string => { + const res = database.add_new(string); + if (res != null) socket.emit("error", res); + }); + + socket.on("set_votes", (string, votes) => { + const res = database.set_votes(string, votes); + if (res != null) socket.emit("error", res); + }); + + socket.on("delete", string =>{ + const res = database.remove(string); + if (res != null) socket.emit("error", res); + }); + + socket.emit("init", database.get()); +}); + + +// ------------------------------ +// setup +// ------------------------------ + +const server = httpServer.listen(PORT, () => { + const host = server.address().address; + const port = server.address().port; + console.log("Server listening at http://" + host + ":" + port); +}); diff --git a/static/index.css b/static/index.css new file mode 100644 index 0000000..1d1c542 --- /dev/null +++ b/static/index.css @@ -0,0 +1,91 @@ +body { + font-family: sans-serif; +} + +#list { + font-size: 30px; +} + +.item { + margin-bottom: 4px; +} + +.item.flash { + background-color: #fdd; +} + +.item.negative { + color: #999; +} + +.item.make-new { + margin-top: 7px; +} + +.item .item-buttons { + display: none; + user-select: none; +} +.item:hover .item-buttons { + display: inline; +} + +.item-bullet { + color: #444; + user-select: none; + margin-right: 10px; +} +.item.negative .item-bullet { + color: #aaa; +} + +.item-votes { + display: inline-block; + font-size: 18px; + color: #444; + vertical-align: 3px; + margin-left: 15px; +} + +.item-upvote { + border: 1px #888 solid; + border-radius: 4px; + background-color: #eee; + color: green; + font-weight: bold; + cursor: pointer; + margin-left: 15px; + padding-left: 8px; + padding-right: 8px; +} + +.item-downvote { + font-size: 23px; + color: blue; + cursor: pointer; + margin-left: 15px; + vertical-align: 2px; +} + +.item-delete { + font-weight: bold; + font-family: mononoki; + color: #f00; + font-size: 28px; + margin-left: 11px; + cursor: pointer; +} + +.new-item-bullet { + color: #888; + font-weight: bold; + font-family: mononoki; + margin-left: 1px; + margin-right: 8px; + user-select: none; + vertical-align: 1px; +} + +.new-item-input { + font-size: 26px; +} diff --git a/static/index.html b/static/index.html new file mode 100644 index 0000000..67ba2f8 --- /dev/null +++ b/static/index.html @@ -0,0 +1,13 @@ +<!DOCTYPE html> +<html> +<head> +<meta charset="utf-8"> +<title>List</title> +<script src="/socket.io/socket.io.js"></script> +<script src="/index.js"></script> +<link rel="stylesheet" href="/index.css"> +</head> +<body> + <div id="list"></div> +</body> +</html> diff --git a/static/index.js b/static/index.js new file mode 100644 index 0000000..23d53ea --- /dev/null +++ b/static/index.js @@ -0,0 +1,196 @@ +var socket = null; +var is_initialised = false; +var glist = []; // [(int, string, element)] +var el_list = null; + +function setupSocket() { + socket = io(); + + socket.on("init", function(list) { + // Reload if server restarted + if (!is_initialised) is_initialised = true; + else { location.reload(); return; } + + glist = list; + for (var i = 0; i < glist.length; i++) glist[i].push(null); + initialiseList(); + }); + + socket.on("error", function(err) { + alert("Error: " + err); + }); + + socket.on("alert", function(text) { + alert(text); + }); +} + +// Returns element +function createItemElement(votes, string) { + var el; + + var el_item = document.createElement("div"); + el_item.classList.add("item"); + if (votes < 0) el_item.classList.add("negative"); + + el = document.createElement("span"); + el.classList.add("item-bullet"); + el.appendChild(document.createTextNode("•")); + el_item.appendChild(el); + + el = document.createElement("span"); + el.classList.add("item-label"); + el.appendChild(document.createTextNode(string)); + el_item.appendChild(el); + + el = document.createElement("span"); + el.classList.add("item-votes"); + el.appendChild(document.createTextNode("[" + votes + "]")); + el_item.appendChild(el); + + var buttons = document.createElement("span"); + buttons.classList.add("item-buttons"); + + el = document.createElement("span"); + el.classList.add("item-upvote"); + el.appendChild(document.createTextNode("⇧")); + el.addEventListener("click", function() { + upvoteItem(string, 1); + }); + buttons.appendChild(el); + + el = document.createElement("span"); + el.classList.add("item-downvote"); + el.appendChild(document.createTextNode("↓")); + el.addEventListener("click", function() { + upvoteItem(string, -1); + }); + buttons.appendChild(el); + + el = document.createElement("span"); + el.classList.add("item-delete"); + el.appendChild(document.createTextNode("⨯")); + el.addEventListener("click", function() { + if (votes < 0) deleteItem(string); + else negateItem(string); + }); + buttons.appendChild(el); + + el_item.appendChild(buttons); + + return el_item; +} + +function initialiseList() { + var el_item, el; + el_list.innerHTML = ""; + + for (var i = 0; i < glist.length; i++) { + el_item = createItemElement(glist[i][0], glist[i][1]); + glist[i][2] = el_item; + el_list.appendChild(el_item); + } + + el_item = document.createElement("div"); + el_item.classList.add("item"); + el_item.classList.add("make-new"); + + el = document.createElement("span"); + el.classList.add("new-item-bullet"); + el.appendChild(document.createTextNode("+")); + el_item.appendChild(el); + + el = document.createElement("input"); + el.type = "text"; + el.setAttribute("size", 21); + el.setAttribute("placeholder", "New item..."); + el.classList.add("new-item-input"); + el.addEventListener("keypress", function(ev) { + if (ev.key == "Enter" || ev.keyCode == 10 || ev.keyCode == 13) { + submitNewItem(ev.target.value); + ev.target.value = ""; + } + }); + el_item.appendChild(el); + + el_list.appendChild(el_item); +} + +function submitNewItem(string) { + for (var i = 0; i < glist.length; i++) { + if (glist[i][1] == string) { + var el = glist[i][2]; + el.classList.add("flash"); + setTimeout(function(i) { el.classList.remove("flash"); }, 200); + return; + } + } + + socket.emit("new", string); + + insertItem(0, string); +} + +function upvoteItem(string, incr) { + for (var i = 0; i < glist.length; i++) { + if (glist[i][1] == string) { + glist[i][0] += incr; + socket.emit("set_votes", string, glist[i][0]); + reinsertItem(i); + break; + } + } +} + +function negateItem(string) { + for (var i = 0; i < glist.length; i++) { + if (glist[i][1] == string) { + glist[i][0] = -1; + socket.emit("set_votes", string, -1); + reinsertItem(i); + break; + } + } +} + +function deleteItem(string) { + for (var i = 0; i < glist.length; i++) { + if (glist[i][1] == string) { + socket.emit("delete", string); + glist[i][2].parentElement.removeChild(glist[i][2]); + glist.splice(i, 1); + break; + } + } +} + +function insertItem(votes, string) { + var i; + for (i = 0; i < glist.length; i++) { + if (glist[i][0] > votes) continue; + if (glist[i][0] < votes || glist[i][1] > string) break; + } + var el = createItemElement(votes, string); + if (i == glist.length) { + glist.push([votes, string, el]); + el_list.insertBefore(el, document.querySelector(".item.make-new")); + } else { + var refel = glist[i][2]; + glist.splice(i, 0, [votes, string, el]); + el_list.insertBefore(el, refel); + } +} + +function reinsertItem(index) { + glist[index][2].parentElement.removeChild(glist[index][2]); + var votes = glist[index][0]; + var string = glist[index][1]; + glist.splice(index, 1); + + insertItem(votes, string); +} + +window.addEventListener("load", function() { + el_list = document.getElementById("list"); + setupSocket(); +}); |